Hydrogen-doped engine intake manifold for multi-point injection
By setting an integrated gas valve seat on the outer periphery of the intake manifold and optimizing the gas injection direction, the problems of insufficient intake volume and uneven gas distribution in traditional multi-point injection gas engines are solved, achieving uniform air mixing and combustion stability, and improving combustion efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEICHAI POWER CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional multi-point injection gas engines suffer from insufficient intake air volume due to the injection pipe occupying the effective area for air to enter the cylinder. Furthermore, hydrogen-blended gas backflow is prone to occur, affecting combustion stability and causing uneven gas distribution.
An integrated gas valve seat is installed on the outer periphery of the first end of the intake manifold to increase the sealing degree of the gas flow path. The angle between the gas injection direction and the airflow direction of the intake manifold is set to less than 90 degrees to ensure that the hydrogen-blended gas flow direction is consistent with the airflow direction. The gas flow velocity is increased by the design of the tapered section and the straight pipe section, and the airflow separation is reduced by the arc transition section to achieve uniform air mixing.
It reduces the possibility of gas leakage, ensures uniform air mixing, avoids the backflow of hydrogen-blended gas, improves combustion stability and air intake, and enhances combustion efficiency.
Smart Images
Figure CN224532859U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engine technology, specifically to an intake manifold for a hydrogen-blended engine with multi-point injection. Background Technology
[0002] Traditional multi-point injection gas engines use injection venturis to input hydrogen-blended gas into the intake manifold. The injection venturis occupies the effective area for air to enter the cylinder, resulting in insufficient intake volume and easy backflow of hydrogen-blended gas, leading to uneven gas distribution among cylinders and affecting combustion stability. Utility Model Content
[0003] In view of this, this application provides an intake manifold for a hydrogen-blended engine with multi-point injection. By setting an integrated gas valve seat on the outer periphery of the first end of the intake manifold, the sealing degree of the gas flow path is increased, reducing the possibility of gas leakage. The angle between the direction of gas injection and the airflow direction of the intake manifold is less than 90 degrees, so that the direction of hydrogen-blended gas flow is consistent with the direction of air flow, ensuring uniform air mixing.
[0004] To achieve the above objectives, this application provides the following technical solution:
[0005] An intake manifold for a hydrogen-blended engine with multi-point injection includes:
[0006] Intake manifold;
[0007] An intake manifold, the first end of which is connected to the main intake pipe, wherein the axis of the intake manifold intersects with and is perpendicular to the axis of the main intake pipe;
[0008] A gas valve seat for setting a gas injection valve is integrally set on the outer periphery of the first end of the intake manifold. A gas injection channel is provided on the gas valve seat, and the gas injection valve is connected to the intake manifold through the gas injection channel.
[0009] The axis of the gas injection channel is perpendicular to the top surface of the gas valve seat, and the angle between the axis of the gas injection channel and the axis of the intake manifold is less than 90°.
[0010] Optionally, the angle between the top surface of the valve seat and the axis of the intake manifold is in the range of 15°-25°.
[0011] Optionally, the angle between the top surface of the valve seat and the axis of the intake manifold is 20°.
[0012] Optionally, the gas injection passage includes a tapered section and a straight pipe section that are arranged and interconnected along the axial direction of the gas injection passage. The first end of the tapered section is open on the top surface of the valve seat, and the second end of the tapered section is connected to the first end of the straight pipe section. The second end of the straight pipe section is open on the inner wall of the intake manifold.
[0013] Optionally, the ratio of the axial length of the tapered section to the axial length of the straight section is in the range of 1.5:1 to 1:1.
[0014] Optionally, the cross-section of the tapering section is an inverted trapezoid.
[0015] Optionally, the intake manifold further includes a second end away from the main intake pipe, and the diameter of the intake manifold gradually decreases from the first end to the second end.
[0016] Optionally, an arc-shaped transition section is provided at the connection between the inner wall of the first end of the intake manifold and the inner wall of the main intake pipe.
[0017] Optionally, the top surface of the valve seat is rectangular, and the bottom surface of the gas injection valve is rectangular with the same size as the top surface of the valve seat. The gas injection valve and the gas valve seat are connected by bolts.
[0018] Optionally, a limiting part is provided on the edge of the top surface of the valve seat near the intake manifold.
[0019] The intake manifold for a hydrogen-blended engine using multi-point injection disclosed in this application increases the sealing performance of the gas flow path and reduces the possibility of gas leakage by directly integrating a gas valve seat on the outer periphery of the first end of the intake manifold. The gas injection valve can be connected to the intake manifold through the gas flow channel, facilitating installation and disassembly. The angle between the axis of the gas injection channel and the axis of the intake manifold is less than 90 degrees, that is, the angle between the direction of gas injection and the airflow direction of the intake manifold is less than 90 degrees. This allows the hydrogen-blended gas flow direction to be consistent with the airflow direction, reducing air resistance, ensuring uniform air mixing, preventing hydrogen-blended gas backflow, and ensuring combustion stability in each cylinder. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the intake manifold of a hydrogen-blended engine for multi-point injection according to this application.
[0022] Figure 2 This is a cross-sectional view of the intake manifold of a hydrogen-blended engine for multi-point injection according to this application.
[0023] Figure 3 for Figure 2 Enlarged view of the structure within the frame.
[0024] exist Figures 1-3 middle:
[0025] 1. Main intake pipe; 2. Intake manifold; 21. First end; 211. Transition section; 22. Second end; 3. Gas valve seat; 31. Gas injection passage; 311. Converging section; 312. Straight pipe section; 32. Top surface of valve seat. Detailed Implementation
[0026] This application provides an intake manifold for a hydrogen-blended engine with multi-point injection. By setting an integrated gas valve seat on the outer periphery of the first end of the intake manifold, the sealing degree of the gas flow path is increased, reducing the possibility of gas leakage. The angle between the direction of gas injection and the airflow direction of the intake manifold is less than 90 degrees, so that the direction of hydrogen-blended gas flow is consistent with the direction of airflow, ensuring uniform air mixing.
[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0028] like Figures 1-2 As shown, this application provides an intake manifold for a hydrogen-blended engine with multi-point injection, comprising:
[0029] Intake manifold 1;
[0030] The intake manifold 2 has its first end 21 connected to the main intake pipe 1. The axis of the intake manifold 2 intersects with and is perpendicular to the axis of the main intake pipe 1.
[0031] The gas valve seat 3 is used to set the gas injection valve. The gas valve seat 3 is integrally set on the outer periphery of the first end 21 of the intake manifold 2. The gas valve seat 3 is provided with a gas injection channel 31. The gas injection valve is connected to the intake manifold 2 through the gas injection channel 31.
[0032] The axis of the gas injection passage 31 is perpendicular to the top surface 32 of the gas valve seat 3, and the angle between the axis of the gas injection passage 31 and the axis of the intake manifold 2 is less than 90 degrees.
[0033] The intake manifold for a hydrogen-blended engine using multi-point injection in this application increases the sealing performance of the gas flow path and reduces the possibility of gas leakage by directly integrating the gas valve seat 3 on the outer periphery of the first end 21 of the intake manifold 2. The gas injection valve can be connected to the intake manifold 2 through the gas flow channel, which is convenient for installation and disassembly. The angle between the axis of the gas injection channel 31 and the axis of the intake manifold 2 is less than 90 degrees, that is, the angle between the direction of gas injection and the airflow direction of the intake manifold 2 is less than 90 degrees. This can make the direction of hydrogen-blended gas flow consistent with the direction of airflow, reduce air flow resistance, ensure uniform air mixing, avoid backflow of hydrogen-blended gas, and ensure combustion stability of each cylinder.
[0034] In a preferred embodiment, the angle between the top surface 32 of the valve seat and the axis of the intake manifold 2 is in the range of 15°-25°.
[0035] The angle between the top surface 32 of the valve seat and the axis of the intake manifold 2 is 15-25°, that is, the angle between the injection direction of the gas flow and the airflow direction in the intake manifold 2 is between 65° and 75°. This avoids the problem of poor mixing effect due to the large angle between the two, or the problem of difficulty in setting the gas valve seat 3 due to the small angle. When the angle between the injection direction of the gas flow and the airflow direction in the intake manifold 2 is between 65° and 75°, the mixing effect and the difficulty in setting the gas valve seat 3 can be taken into account. This ensures that the air entering from the intake manifold 2 and the gas entering from the gas injection channel 31 have sufficient mixing length, and a strong airflow mixing effect can be achieved.
[0036] Furthermore, the angle between the top surface 32 of the valve seat and the axis of the intake manifold 2 is 20°, which means that the injection direction of the gas flow is at an angle of 70° with the air flow direction in the intake manifold 2. This can further ensure that the air entering from the intake manifold 2 and the gas entering from the gas injection channel 31 have sufficient mixing length, thus achieving a stronger airflow mixing effect.
[0037] In a preferred embodiment, such as Figure 2 and Figure 3 As shown, the gas injection passage 31 includes a tapered section 311 and a straight pipe section 312 that are arranged along the axial direction of the gas injection passage 31 and are interconnected. The first end 21 of the tapered section 311 is opened on the top surface 32 of the valve seat, and the second end 22 of the tapered section 311 is connected to the first end 21 of the straight pipe section 312. The second end 22 of the straight pipe section 312 is opened on the inner wall of the intake manifold 2.
[0038] The gas flow velocity can be further increased by passing through the converging section 311, and the gas flow velocity can be maintained at a high speed when entering the intake manifold 2 through the straight pipe section 312.
[0039] In a preferred embodiment, the ratio of the axial length of the tapered section 311 to the straight section 312 is in the range of 1.5:1 to 1:1.
[0040] When the ratio of the axial length of the converging section 311 to the straight section 312 is 1.5:1, the length of the converging section 311 is higher, allowing the gas flow to have a more sufficient distance to complete the conversion of pressure energy into kinetic energy, thus avoiding flow separation or eddies due to excessively rapid contraction. When the ratio of the axial length of the converging section 311 to the straight section 312 is 1:1, the length of the straight section 312 is appropriately shortened compared to the previous case, which can maintain the stability of high-speed flow and reduce friction loss. Therefore, it is advisable to control the ratio of the axial length of the converging section 311 to the straight section 312 within the above range, which can ensure the flow velocity while avoiding flow separation or eddies.
[0041] In a preferred embodiment, such as Figures 1-3 As shown, the cross-section of the tapered section 311 is an inverted trapezoid. The inverted trapezoidal cross-section is easy to mold and mass-produce. The inverted trapezoidal structure takes into account both functionality and production efficiency.
[0042] In a preferred embodiment, such as Figure 2 As shown, the intake manifold 2 also includes a second end 22 away from the main intake pipe 1, and the diameter of the intake manifold 2 gradually decreases from the first end 21 to the second end 22.
[0043] The tapered intake manifold 2 structure gradually reduces the cross-sectional area of the pipe, thereby increasing the speed of the airflow during its journey, enhancing the kinetic energy of the intake flow, increasing the intake negative pressure under low-speed conditions, and promoting fuel atomization and mixture formation.
[0044] In a preferred embodiment, such as Figure 2 As shown, an arc-shaped transition section 211 is provided at the connection between the inner wall of the first end 21 of the intake manifold 2 and the inner wall of the intake main pipe 1.
[0045] The curved transition section 211 reduces airflow separation at corners and avoids vortices and turbulence caused by right-angle or acute-angle transitions. This design allows airflow to enter the intake manifold 2 more smoothly, reducing local drag and thus reducing pressure loss in the overall intake system.
[0046] Reducing airflow separation and pressure loss means that more air can enter the cylinder efficiently, especially under turbocharging or high-speed conditions. The smooth transition design can maximize the intake volume, thereby optimizing combustion efficiency and improving power output.
[0047] In a preferred embodiment, such as Figure 1As shown, in order to facilitate the alignment and assembly of the gas valve seat 3 and the gas injection valve, the top surface 32 of the valve seat is rectangular, and the bottom surface of the gas injection valve is a rectangle with the same size as the top surface 32 of the valve seat. In this way, the four edges of the bottom surface of the gas injection valve can be aligned with the edges of the top surface 32 of the valve seat to quickly find the correct position.
[0048] The gas injection valve is connected to the gas valve seat 3 by bolts. The top surface 32 of the valve seat is provided with bolt holes. The gas injection valve is provided with countersunk holes corresponding to the above-mentioned bolt holes. The bolts pass through the countersunk holes and are threadedly connected to the bolt holes to fix the gas injection valve to the top of the gas valve seat 3.
[0049] In a preferred embodiment, a limiting part is provided on the side edge of the valve seat top surface 32 near the intake manifold 1. The limiting part can be a ridge along the side edge of the valve seat top surface 32 near the intake manifold 1. Since the valve seat top surface 32 is inclined toward the intake manifold 1, the limiting part can prevent the gas injection valve provided on the valve seat top surface 32 from sliding toward the intake manifold 1, and can also further help the gas injection valve to be quickly positioned.
[0050] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.
[0051] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the word “or” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.
[0052] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled or recombined. These disassemblies or recombinations should be considered as equivalent solutions of this application.
[0053] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.
[0054] It should be understood that the qualifying terms “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.
[0055] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.
Claims
1. An intake manifold for a hydrogen-blended engine with multi-point injection, characterized in that, include: Intake manifold; An intake manifold, the first end of which is connected to the main intake pipe, wherein the axis of the intake manifold intersects with and is perpendicular to the axis of the main intake pipe; A gas valve seat for setting a gas injection valve is integrally set on the outer periphery of the first end of the intake manifold. A gas injection channel is provided on the gas valve seat, and the gas injection valve is connected to the intake manifold through the gas injection channel. The axis of the gas injection channel is perpendicular to the top surface of the gas valve seat, and the angle between the axis of the gas injection channel and the axis of the intake manifold is less than 90°.
2. The hydrogen-blended engine intake pipe for multi-point injection according to claim 1, characterized in that, The angle between the top surface of the valve seat and the axis of the intake manifold is in the range of 15°-25°.
3. The hydrogen-blended engine intake pipe for multi-point injection according to claim 2, characterized in that, The angle between the top surface of the valve seat and the axis of the intake manifold is 20°.
4. The hydrogen-blended engine intake pipe for multi-point injection according to claim 1, characterized in that, The gas injection passage includes a tapered section and a straight pipe section that are arranged and interconnected along the axial direction of the gas injection passage. The first end of the tapered section is open on the top surface of the valve seat, and the second end of the tapered section is connected to the first end of the straight pipe section. The second end of the straight pipe section is open on the inner wall of the intake manifold.
5. The hydrogen-blended engine intake manifold for multi-point injection according to claim 4, characterized in that, The ratio of the axial length of the tapered section to the axial length of the straight section is in the range of 1.5:1 to 1:
1.
6. The hydrogen-blended engine intake manifold for multi-point injection according to claim 4, characterized in that, The cross-section of the tapering section is an inverted trapezoid.
7. The hydrogen-blended engine intake pipe for multi-point injection according to claim 1, characterized in that, The intake manifold also includes a second end located away from the main intake pipe, and the diameter of the intake manifold gradually decreases from the first end to the second end.
8. The hydrogen-blended engine intake manifold for multi-point injection according to claim 7, characterized in that, An arc-shaped transition section is provided at the connection between the inner wall of the first end of the intake manifold and the inner wall of the main intake pipe.
9. The hydrogen-blended engine intake manifold for multi-point injection according to claim 1, characterized in that, The top surface of the valve seat is rectangular, and the bottom surface of the gas injection valve is rectangular with the same size as the top surface of the valve seat. The gas injection valve and the gas valve seat are connected by bolts.
10. The hydrogen-blended engine intake manifold for multi-point injection according to claim 9, characterized in that, A limiting part is provided on the edge of the top surface of the valve seat near the intake manifold.